Answer:
4 years old
Step-by-step explanation:
Tracy's age = x
Tracy's mother's age = 6x
x + 6x = 28
7x = 28
x = 4
Tracy is 4 years old
Answer:
f(2)=1
f(2) means that 2 is being plugged in for x so look for the y value when x is 2
in this case y is 1 when x is 2
Step-by-step explanation:
Well Jay has 20 phone numbers.
20j=13r-3x2 im not sure but i hope that helped a little.
We do as follows:
let x = amount of 45% solution
y = amount of 30% solution
overall balance => x + y = 450
acid balance => .45x + .30y = .40(450)
Solving simultaneously, we will have:
x = 300 mL
y = 150 mL
This is assuming that partial molar properties does not affect the volume greatly. Hope this answers the question. Have a nice day.
